990 NODULARIA 
NoOpULARIA PUGIO (Benson). 
Shell irregularly long ovate, subsolid to solid, subinflated, 
inequilateral; beaks somewhat elevated but not very Tall: 
posterior ridge strong, sharply angled, nearly straight or light- 
ly curved, ending in a decided, rather prolonged point at or 
below the median line; anterior end rounded; base line nearly 
straight, inflated behind the middle and ending behind in a 
long, oblique, truncation; hinge line decidedly curved behind 
the pseudocardinals ; dorsal slope having a long, oblique trun- 
cation; surface irregularly striate; posterior slope often pli- 
cate; epidermis yellowish, tawny or greenish, often banded, 
subshining ; pseudocardinals subcompressed, ragged; laterals 
remote; muscle scars impressed; nacre dirty flesh-color. 
Length 60, height 30, diam. 20 mm. 
Burma. 
Unio pugio Benson, Ann. and Mag., X, 1862, p. 193—SOWER- 
By. Conch: Icons XVI, 18664 ple xev, Hows 16. 
Nodularia pugio Simpson, Syn., 1900, p. 814. 
Oxynaia pugio Haass, Con. Cab., Unio, 1910, pl. xiv, figs. 6-7. 
Sowerby’s figure represents a young specimen. The color 
of this species is quite variable, some specimens being almost 
clear green, others olive-green, while still others are tawny, 
but all that I have seen are banded. The high, sharp posterior 
ridge and long, sharp posterior point are good distinguishing 
characters. 
NoODULARIA MICHELOTI (Morlet). 
Shell subovate, solid, inflated, inequilateral, somewhat nar- 
rowed and rounded in front; base line lightly curved, full 
and rounded behind the middle; dorsal outline almost evenly 
curved; posterior ridge rather high, subangulate, placed close 
to the dorsal margin and parallel with it, ending in a blunt 
point above the median line; surface sculptured with irregu- 
lar strize; epidermis olive-green and black; pseudocardinals 
somewhat solid; laterals strong, nearly straight; anterior 
scars deep; posterior scars shallow ; nacre straw-colored. 
Length 38, height 21, diam. 15 mm. 
Tonkin. 
